[PATCH] sibling map initializing rework

Make sibling map init per-cpu.  Hotplug CPU may change the map at runtime.

Signed-off-by: Li Shaohua<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 50 insertions, 47 deletions

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index c5517f332309..09b4ceb832b2 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -66,11 +66,21 @@ int smp_num_siblings = 1;
 #ifdef CONFIG_X86_HT
 EXPORT_SYMBOL(smp_num_siblings);
 #endif
-int phys_proc_id[NR_CPUS]; /* Package ID of each logical CPU */
+
+/* Package ID of each logical CPU */
+int phys_proc_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};
 EXPORT_SYMBOL(phys_proc_id);
-int cpu_core_id[NR_CPUS]; /* Core ID of each logical CPU */
+
+/* Core ID of each logical CPU */
+int cpu_core_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};
 EXPORT_SYMBOL(cpu_core_id);
 
+cpumask_t cpu_sibling_map[NR_CPUS];
+EXPORT_SYMBOL(cpu_sibling_map);
+
+cpumask_t cpu_core_map[NR_CPUS];
+EXPORT_SYMBOL(cpu_core_map);
+
 /* bitmap of online cpus */
 cpumask_t cpu_online_map;
 EXPORT_SYMBOL(cpu_online_map);
@@ -423,6 +433,38 @@ static void __init smp_callin(void)
 
 static int cpucount;
 
+static inline void
+set_cpu_sibling_map(int cpu)
+{
+        int i;
+
+        if (smp_num_siblings > 1) {
+                for (i = 0; i < NR_CPUS; i++) {
+                        if (!cpu_isset(i, cpu_callout_map))
+                                continue;
+                        if (cpu_core_id[cpu] == cpu_core_id[i]) {
+                                cpu_set(i, cpu_sibling_map[cpu]);
+                                cpu_set(cpu, cpu_sibling_map[i]);
+                        }
+                }
+        } else {
+                cpu_set(cpu, cpu_sibling_map[cpu]);
+        }
+
+        if (current_cpu_data.x86_num_cores > 1) {
+                for (i = 0; i < NR_CPUS; i++) {
+                        if (!cpu_isset(i, cpu_callout_map))
+                                continue;
+                        if (phys_proc_id[cpu] == phys_proc_id[i]) {
+                                cpu_set(i, cpu_core_map[cpu]);
+                                cpu_set(cpu, cpu_core_map[i]);
+                        }
+                }
+        } else {
+                cpu_core_map[cpu] = cpu_sibling_map[cpu];
+        }
+}
+
 /*
  * Activate a secondary processor.
  */
@@ -450,6 +492,10 @@ static void __init start_secondary(void *unused)
          */
         local_flush_tlb();
 
+        /* This must be done before setting cpu_online_map */
+        set_cpu_sibling_map(raw_smp_processor_id());
+        wmb();
+
         /*
          * We need to hold call_lock, so there is no inconsistency
          * between the time smp_call_function() determines number of
@@ -912,13 +958,6 @@ void *xquad_portio;
 EXPORT_SYMBOL(xquad_portio);
 #endif
 
-cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
-#ifdef CONFIG_X86_HT
-EXPORT_SYMBOL(cpu_sibling_map);
-#endif
-cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
-EXPORT_SYMBOL(cpu_core_map);
-
 static void __init smp_boot_cpus(unsigned int max_cpus)
 {
         int apicid, cpu, bit, kicked;
@@ -1082,44 +1121,8 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
                 cpus_clear(cpu_core_map[cpu]);
         }
 
-        for (cpu = 0; cpu < NR_CPUS; cpu++) {
-                struct cpuinfo_x86 *c = cpu_data + cpu;
-                int siblings = 0;
-                int i;
-                if (!cpu_isset(cpu, cpu_callout_map))
-                        continue;
-
-                if (smp_num_siblings > 1) {
-                        for (i = 0; i < NR_CPUS; i++) {
-                                if (!cpu_isset(i, cpu_callout_map))
-                                        continue;
-                                if (cpu_core_id[cpu] == cpu_core_id[i]) {
-                                        siblings++;
-                                        cpu_set(i, cpu_sibling_map[cpu]);
-                                }
-                        }
-                } else {
-                        siblings++;
-                        cpu_set(cpu, cpu_sibling_map[cpu]);
-                }
-
-                if (siblings != smp_num_siblings) {
-                        printk(KERN_WARNING "WARNING: %d siblings found for CPU%d, should be %d\n", siblings, cpu, smp_num_siblings);
-                        smp_num_siblings = siblings;
-                }
-
-                if (c->x86_num_cores > 1) {
-                        for (i = 0; i < NR_CPUS; i++) {
-                                if (!cpu_isset(i, cpu_callout_map))
-                                        continue;
-                                if (phys_proc_id[cpu] == phys_proc_id[i]) {
-                                        cpu_set(i, cpu_core_map[cpu]);
-                                }
-                        }
-                } else {
-                        cpu_core_map[cpu] = cpu_sibling_map[cpu];
-                }
-        }
+        cpu_set(0, cpu_sibling_map[0]);
+        cpu_set(0, cpu_core_map[0]);
 
         smpboot_setup_io_apic();